7 Mistakes You’re Making with Your NWA Air Conditioning (and How to Fix Them)

Living in Northwest Arkansas means enjoying the beautiful Ozark scenery, but it also means bracing for some of the most humid, sweltering summers in the country. When the humidity peaks in July and August, your air conditioning system isn't just a luxury: it’s a necessity for your home’s safety and comfort.

At Emperial Electric HVAC Plumbing, we see it all the time: high energy bills, systems that fail on the hottest day of the year, and homes that feel like a sauna despite the AC running 24/7. Most of these issues stem from a handful of common mistakes homeowners make. Because we handle everything from complex wiring to full HVAC installs, we have a unique perspective on how your home’s systems work together.

Here are the seven most common mistakes you’re making with your NWA air conditioning and exactly how we can help you fix them.

1. Choosing a Wrongly-Sized AC Unit

Many folks think that when it comes to air conditioning, bigger is always better. They assume a larger unit will cool the house faster. This is one of the most expensive misconceptions in the industry.

When an AC unit is too large for the square footage of your home, it results in "short cycling." The unit turns on, blasts the house with cold air, reaches the thermostat setting in minutes, and shuts off. This prevents the system from running long enough to perform its most important secondary job: dehumidification. In Northwest Arkansas, removing moisture is just as important as lowering the temperature. A system that is too small, on the other hand, will run constantly, driving up your electric bill and wearing out the compressor prematurely.

The Fix: We always perform a professional load calculation before any HVAC installation. We look at your home’s insulation, window types, and layout to ensure you have the perfect fit.

2. Incorrectly Positioning the Thermostat

Your thermostat is the "brain" of your HVAC system. If the brain is getting bad information, the whole system suffers. We often see thermostats placed in hallways directly across from a sunny window or on an exterior wall that gets hot in the afternoon.

If your thermostat is sitting in direct sunlight, it thinks the entire house is 85 degrees, even if the rest of your home is a comfortable 72. This causes the system to overwork, leading to freezing coils and unnecessary wear.

The Fix: Ideally, your thermostat should be in a central, shaded area away from drafts, windows, and doors. If you’re moving into a new build or remodeling, consult with a qualified electrician nwa to ensure the low-voltage wiring is positioned in the most efficient spot for accurate readings.

3. Placing Your Outdoor Unit in the Wrong Location

The outdoor condenser unit needs to breathe. It’s responsible for releasing the heat collected from inside your home. If that unit is placed on the southwest side of your house in full afternoon sun, it has to work much harder to dissipate that heat.

Furthermore, we often see homeowners try to "hide" their units with heavy landscaping or tight fencing. While we understand the desire for curb appeal, choking your AC unit restricts airflow and can lead to a system meltdown.

The Fix: Position your unit on the north or east side of your home if possible. If it must be in the sun, consider a specialized awning or strategic (but breathable) landscaping to provide shade. Check out our HVAC system installations portfolio to see how we properly site units for maximum efficiency.

4. Setting Your Thermostat Too Low

We’ve all done it. You come home to a hot house, and you crank the thermostat down to 60 degrees, thinking it will cool the house faster. Unfortunately, AC systems don't work like a gas pedal; they only have one "speed" (unless you have a modern variable-speed inverter).

Setting it to 60 won't make the air coming out of the vents any colder; it just tells the system to stay on for hours until it reaches an impossible temperature. This is a leading cause of frozen evaporator coils.

The Fix: Set the thermostat to your desired comfortable temperature (usually 72-75 degrees) and leave it. If you want a cooler home when you arrive, consider upgrading to a smart thermostat that can be adjusted via your phone while you’re still at the office in Bentonville or Rogers.

5. Setting the Fan to "On" Instead of "Auto"

This is a mistake specific to humid climates like ours. Your thermostat likely has two fan settings: "On" and "Auto." When you set it to "On," the fan blows air through your vents 24/7, even when the cooling compressor is off.

The problem? During a cooling cycle, the indoor coil gets very wet as it pulls moisture out of the air. When the compressor shuts off but the fan keeps blowing, that moisture on the coil evaporates right back into the air and is blown back into your living room. This can lead to a "clammy" feeling in your home and even mold growth in the ductwork.

The Fix: Always keep your fan set to "Auto." This ensures the fan only runs when the air is actively being cooled and dehumidified.

6. Neglecting Maintenance and the 2026 Transition

A dirty air filter is the number one cause of HVAC service calls. It restricts airflow, makes the motor work harder, and lowers your indoor air quality. Beyond the filter, many NWA homeowners skip their annual professional tune-ups.

This is especially risky right now. The HVAC industry is currently undergoing a major shift. The 2026 refrigerant transition means that older systems using R-410A will become increasingly expensive to repair as those refrigerants are phased out.

The Fix: Change your filters every 30-90 days. More importantly, schedule a bi-annual maintenance check. We inspect the electrical connections, clean the coils, and check refrigerant levels to catch small problems before they become $5,000 disasters.

7. The Electrical Connection: Don't DIY Your Power

Your AC system is likely the largest electrical load in your home. We’ve seen many DIY "fixes" where homeowners or unlicensed handymen try to swap out a capacitor or a contactor and end up damaging the entire electrical panel.

Modern high-efficiency units require specific breakers and wire gauges. If your lights flicker when the AC kicks on, you may have a loose connection or an overloaded circuit. This is where having a team of electricians in northwest arkansas who also understand HVAC is a game-changer. We don't just fix the air; we ensure the "heart" of the system: the electrical supply: is safe and up to code.

The Fix: If you are experiencing electrical hiccups with your cooling, it might be time for a panel upgrade. A stable power supply extends the life of your AC components significantly.

Why NWA Homeowners Trust Emperial

At Emperial Electric HVAC Plumbing, we believe in a comprehensive approach to home health. Whether we are working on residential new construction or responding to an emergency call, our goal is to build efficient, long-lasting systems.

Mistakes with your AC don't just cost you money; they cost you peace of mind. Our team is trained to handle the intersection of electrical, plumbing, and HVAC, making us the go-to experts for Northwest Arkansas residents who want the job done right the first time.

Ready for a Cooler Summer?

Don't wait until the first 90-degree day to find out your system is failing. Whether you need a routine tune-up, a complete system overhaul, or you’re worried about your home’s electrical capacity, we’re here to help.

Contact us today at Emperial Electric HVAC Plumbing to schedule your inspection. One call truly does it all.